Summary
We show that a detailed understanding of the influence of the exciton-exciton interaction on the non-linear excitonic response in a GaAs/AlGaAs superlattice can be obtained by changing the external applied field. In time-resolved four-wave mixing this implies a change from a third-order polarization signal dominated by phase space occupation to a Coulomb interaction-induced signal when the bias is increased at high excitation densities. The experimental data are compared with theoretical results based on the numerical solution of the semiconductor Bloch equations.
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Beck, W., Leisching, P., Kurz, H. et al. External-field-dependent enhancement of internal Coulomb interactions in time-resolved four-wave mixing. Il Nuovo Cimento D 17, 1355–1358 (1995). https://doi.org/10.1007/BF02457209
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DOI: https://doi.org/10.1007/BF02457209